Evidence from 40Ar/39Ar ages for a Churchill province source of ice-rafted amphiboles in Heinrich layer 2 Gwiazda, Roberto H. ; Hemming, Sidney R. ; Broecker, Wallace S. ; Onsttott, Tullis ; Mueller, Chris Abstract Publication: Journal of Glaciology Pub Date: 1996 DOI: 10.1017/S0022143000003427 Bibcode: 1996JGlac..42..440G